Answer:
C. Free Verse.
Step-by-step explanation:
Free verse is a poetic form that has no specific rhyme or meter in its form. They are more like a regular normal speech, which has no restrictions or rules as such in them.
Couplets are two lines in a verse that have the same rhyming scheme and same meter form.
Sonnets are the lyrical verse forms that have fourteen lines and written in iambic pentameter, that is, it contains alternating stressed and unstressed syllables of ten syllables.